1403 lines
47 KiB
C
1403 lines
47 KiB
C
/*
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* AVI demuxer
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* Copyright (c) 2001 Fabrice Bellard
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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//#define DEBUG
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//#define DEBUG_SEEK
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#include <strings.h>
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#include "libavutil/intreadwrite.h"
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#include "libavutil/bswap.h"
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#include "libavcodec/bytestream.h"
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#include "avformat.h"
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#include "avi.h"
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#include "dv.h"
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#include "riff.h"
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#undef NDEBUG
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#include <assert.h>
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typedef struct AVIStream {
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int64_t frame_offset; /* current frame (video) or byte (audio) counter
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(used to compute the pts) */
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int remaining;
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int packet_size;
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int scale;
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int rate;
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int sample_size; /* size of one sample (or packet) (in the rate/scale sense) in bytes */
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int64_t cum_len; /* temporary storage (used during seek) */
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int prefix; ///< normally 'd'<<8 + 'c' or 'w'<<8 + 'b'
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int prefix_count;
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uint32_t pal[256];
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int has_pal;
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int dshow_block_align; ///< block align variable used to emulate bugs in the MS dshow demuxer
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AVFormatContext *sub_ctx;
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AVPacket sub_pkt;
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uint8_t *sub_buffer;
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} AVIStream;
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typedef struct {
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int64_t riff_end;
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int64_t movi_end;
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int64_t fsize;
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int64_t movi_list;
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int64_t last_pkt_pos;
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int index_loaded;
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int is_odml;
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int non_interleaved;
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int stream_index;
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DVDemuxContext* dv_demux;
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int odml_depth;
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#define MAX_ODML_DEPTH 1000
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} AVIContext;
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static const char avi_headers[][8] = {
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', ' ' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 'X' },
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{ 'R', 'I', 'F', 'F', 'A', 'V', 'I', 0x19},
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{ 'O', 'N', '2', ' ', 'O', 'N', '2', 'f' },
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{ 'R', 'I', 'F', 'F', 'A', 'M', 'V', ' ' },
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{ 0 }
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};
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static int avi_load_index(AVFormatContext *s);
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static int guess_ni_flag(AVFormatContext *s);
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#ifdef DEBUG
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static void print_tag(const char *str, unsigned int tag, int size)
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{
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dprintf(NULL, "%s: tag=%c%c%c%c size=0x%x\n",
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str, tag & 0xff,
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(tag >> 8) & 0xff,
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(tag >> 16) & 0xff,
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(tag >> 24) & 0xff,
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size);
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}
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#endif
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static inline int get_duration(AVIStream *ast, int len){
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if(ast->sample_size){
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return len;
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}else if (ast->dshow_block_align){
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return (len + ast->dshow_block_align - 1)/ast->dshow_block_align;
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}else
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return 1;
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}
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static int get_riff(AVFormatContext *s, ByteIOContext *pb)
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{
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AVIContext *avi = s->priv_data;
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char header[8];
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int i;
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/* check RIFF header */
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get_buffer(pb, header, 4);
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avi->riff_end = get_le32(pb); /* RIFF chunk size */
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avi->riff_end += url_ftell(pb); /* RIFF chunk end */
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get_buffer(pb, header+4, 4);
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for(i=0; avi_headers[i][0]; i++)
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if(!memcmp(header, avi_headers[i], 8))
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break;
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if(!avi_headers[i][0])
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return -1;
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if(header[7] == 0x19)
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av_log(s, AV_LOG_INFO, "This file has been generated by a totally broken muxer.\n");
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return 0;
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}
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static int read_braindead_odml_indx(AVFormatContext *s, int frame_num){
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AVIContext *avi = s->priv_data;
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ByteIOContext *pb = s->pb;
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int longs_pre_entry= get_le16(pb);
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int index_sub_type = get_byte(pb);
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int index_type = get_byte(pb);
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int entries_in_use = get_le32(pb);
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int chunk_id = get_le32(pb);
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int64_t base = get_le64(pb);
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int stream_id= 10*((chunk_id&0xFF) - '0') + (((chunk_id>>8)&0xFF) - '0');
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AVStream *st;
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AVIStream *ast;
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int i;
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int64_t last_pos= -1;
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int64_t filesize= url_fsize(s->pb);
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "longs_pre_entry:%d index_type:%d entries_in_use:%d chunk_id:%X base:%16"PRIX64"\n",
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longs_pre_entry,index_type, entries_in_use, chunk_id, base);
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#endif
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if(stream_id >= s->nb_streams || stream_id < 0)
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return -1;
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st= s->streams[stream_id];
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ast = st->priv_data;
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if(index_sub_type)
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return -1;
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get_le32(pb);
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if(index_type && longs_pre_entry != 2)
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return -1;
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if(index_type>1)
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return -1;
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if(filesize > 0 && base >= filesize){
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av_log(s, AV_LOG_ERROR, "ODML index invalid\n");
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if(base>>32 == (base & 0xFFFFFFFF) && (base & 0xFFFFFFFF) < filesize && filesize <= 0xFFFFFFFF)
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base &= 0xFFFFFFFF;
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else
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return -1;
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}
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for(i=0; i<entries_in_use; i++){
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if(index_type){
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int64_t pos= get_le32(pb) + base - 8;
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int len = get_le32(pb);
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int key= len >= 0;
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len &= 0x7FFFFFFF;
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#ifdef DEBUG_SEEK
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av_log(s, AV_LOG_ERROR, "pos:%"PRId64", len:%X\n", pos, len);
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#endif
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if(url_feof(pb))
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return -1;
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if(last_pos == pos || pos == base - 8)
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avi->non_interleaved= 1;
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if(last_pos != pos && (len || !ast->sample_size))
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av_add_index_entry(st, pos, ast->cum_len, len, 0, key ? AVINDEX_KEYFRAME : 0);
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ast->cum_len += get_duration(ast, len);
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last_pos= pos;
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}else{
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int64_t offset, pos;
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int duration;
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offset = get_le64(pb);
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get_le32(pb); /* size */
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duration = get_le32(pb);
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if(url_feof(pb))
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return -1;
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pos = url_ftell(pb);
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if(avi->odml_depth > MAX_ODML_DEPTH){
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av_log(s, AV_LOG_ERROR, "Too deeply nested ODML indexes\n");
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return -1;
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}
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url_fseek(pb, offset+8, SEEK_SET);
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avi->odml_depth++;
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read_braindead_odml_indx(s, frame_num);
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avi->odml_depth--;
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frame_num += duration;
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url_fseek(pb, pos, SEEK_SET);
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}
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}
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avi->index_loaded=1;
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return 0;
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}
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static void clean_index(AVFormatContext *s){
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int i;
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int64_t j;
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for(i=0; i<s->nb_streams; i++){
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AVStream *st = s->streams[i];
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AVIStream *ast = st->priv_data;
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int n= st->nb_index_entries;
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int max= ast->sample_size;
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int64_t pos, size, ts;
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if(n != 1 || ast->sample_size==0)
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continue;
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while(max < 1024) max+=max;
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pos= st->index_entries[0].pos;
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size= st->index_entries[0].size;
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ts= st->index_entries[0].timestamp;
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for(j=0; j<size; j+=max){
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av_add_index_entry(st, pos+j, ts+j, FFMIN(max, size-j), 0, AVINDEX_KEYFRAME);
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}
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}
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}
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static int avi_read_tag(AVFormatContext *s, AVStream *st, uint32_t tag, uint32_t size)
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{
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ByteIOContext *pb = s->pb;
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char key[5] = {0}, *value;
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size += (size & 1);
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if (size == UINT_MAX)
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return -1;
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value = av_malloc(size+1);
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if (!value)
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return -1;
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get_buffer(pb, value, size);
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value[size]=0;
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AV_WL32(key, tag);
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return av_metadata_set2(st ? &st->metadata : &s->metadata, key, value,
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AV_METADATA_DONT_STRDUP_VAL);
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}
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static void avi_read_info(AVFormatContext *s, uint64_t end)
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{
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while (url_ftell(s->pb) < end) {
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uint32_t tag = get_le32(s->pb);
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uint32_t size = get_le32(s->pb);
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avi_read_tag(s, NULL, tag, size);
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}
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}
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static const char months[12][4] = { "Jan", "Feb", "Mar", "Apr", "May", "Jun",
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"Jul", "Aug", "Sep", "Oct", "Nov", "Dec" };
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static void avi_metadata_creation_time(AVMetadata **metadata, char *date)
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{
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char month[4], time[9], buffer[64];
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int i, day, year;
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/* parse standard AVI date format (ie. "Mon Mar 10 15:04:43 2003") */
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if (sscanf(date, "%*3s%*[ ]%3s%*[ ]%2d%*[ ]%8s%*[ ]%4d",
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month, &day, time, &year) == 4) {
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for (i=0; i<12; i++)
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if (!strcasecmp(month, months[i])) {
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snprintf(buffer, sizeof(buffer), "%.4d-%.2d-%.2d %s",
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year, i+1, day, time);
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av_metadata_set2(metadata, "creation_time", buffer, 0);
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}
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} else if (date[4] == '/' && date[7] == '/') {
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date[4] = date[7] = '-';
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av_metadata_set2(metadata, "creation_time", date, 0);
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}
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}
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static void avi_read_nikon(AVFormatContext *s, uint64_t end)
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{
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while (url_ftell(s->pb) < end) {
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uint32_t tag = get_le32(s->pb);
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uint32_t size = get_le32(s->pb);
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switch (tag) {
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case MKTAG('n', 'c', 't', 'g'): { /* Nikon Tags */
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uint64_t tag_end = url_ftell(s->pb) + size;
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while (url_ftell(s->pb) < tag_end) {
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uint16_t tag = get_le16(s->pb);
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uint16_t size = get_le16(s->pb);
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const char *name = NULL;
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char buffer[64] = {0};
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size -= get_buffer(s->pb, buffer,
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FFMIN(size, sizeof(buffer)-1));
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switch (tag) {
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case 0x03: name = "maker"; break;
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case 0x04: name = "model"; break;
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case 0x13: name = "creation_time";
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if (buffer[4] == ':' && buffer[7] == ':')
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buffer[4] = buffer[7] = '-';
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break;
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}
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if (name)
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av_metadata_set2(&s->metadata, name, buffer, 0);
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url_fskip(s->pb, size);
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}
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break;
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}
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default:
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url_fskip(s->pb, size);
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break;
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}
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}
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}
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static int avi_read_header(AVFormatContext *s, AVFormatParameters *ap)
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{
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AVIContext *avi = s->priv_data;
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ByteIOContext *pb = s->pb;
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unsigned int tag, tag1, handler;
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int codec_type, stream_index, frame_period, bit_rate;
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unsigned int size;
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int i;
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AVStream *st;
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AVIStream *ast = NULL;
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int avih_width=0, avih_height=0;
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int amv_file_format=0;
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uint64_t list_end = 0;
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avi->stream_index= -1;
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if (get_riff(s, pb) < 0)
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return -1;
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avi->fsize = url_fsize(pb);
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if(avi->fsize<=0)
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avi->fsize= avi->riff_end == 8 ? INT64_MAX : avi->riff_end;
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/* first list tag */
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stream_index = -1;
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codec_type = -1;
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frame_period = 0;
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for(;;) {
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if (url_feof(pb))
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goto fail;
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tag = get_le32(pb);
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size = get_le32(pb);
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#ifdef DEBUG
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print_tag("tag", tag, size);
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#endif
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switch(tag) {
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case MKTAG('L', 'I', 'S', 'T'):
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list_end = url_ftell(pb) + size;
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/* Ignored, except at start of video packets. */
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tag1 = get_le32(pb);
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#ifdef DEBUG
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print_tag("list", tag1, 0);
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#endif
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if (tag1 == MKTAG('m', 'o', 'v', 'i')) {
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avi->movi_list = url_ftell(pb) - 4;
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if(size) avi->movi_end = avi->movi_list + size + (size & 1);
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else avi->movi_end = url_fsize(pb);
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dprintf(NULL, "movi end=%"PRIx64"\n", avi->movi_end);
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goto end_of_header;
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}
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else if (tag1 == MKTAG('I', 'N', 'F', 'O'))
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avi_read_info(s, list_end);
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else if (tag1 == MKTAG('n', 'c', 'd', 't'))
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avi_read_nikon(s, list_end);
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break;
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case MKTAG('I', 'D', 'I', 'T'): {
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unsigned char date[64] = {0};
|
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size += (size & 1);
|
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size -= get_buffer(pb, date, FFMIN(size, sizeof(date)-1));
|
|
url_fskip(pb, size);
|
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avi_metadata_creation_time(&s->metadata, date);
|
|
break;
|
|
}
|
|
case MKTAG('d', 'm', 'l', 'h'):
|
|
avi->is_odml = 1;
|
|
url_fskip(pb, size + (size & 1));
|
|
break;
|
|
case MKTAG('a', 'm', 'v', 'h'):
|
|
amv_file_format=1;
|
|
case MKTAG('a', 'v', 'i', 'h'):
|
|
/* AVI header */
|
|
/* using frame_period is bad idea */
|
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frame_period = get_le32(pb);
|
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bit_rate = get_le32(pb) * 8;
|
|
get_le32(pb);
|
|
avi->non_interleaved |= get_le32(pb) & AVIF_MUSTUSEINDEX;
|
|
|
|
url_fskip(pb, 2 * 4);
|
|
get_le32(pb);
|
|
get_le32(pb);
|
|
avih_width=get_le32(pb);
|
|
avih_height=get_le32(pb);
|
|
|
|
url_fskip(pb, size - 10 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'h'):
|
|
/* stream header */
|
|
|
|
tag1 = get_le32(pb);
|
|
handler = get_le32(pb); /* codec tag */
|
|
|
|
if(tag1 == MKTAG('p', 'a', 'd', 's')){
|
|
url_fskip(pb, size - 8);
|
|
break;
|
|
}else{
|
|
stream_index++;
|
|
st = av_new_stream(s, stream_index);
|
|
if (!st)
|
|
goto fail;
|
|
|
|
ast = av_mallocz(sizeof(AVIStream));
|
|
if (!ast)
|
|
goto fail;
|
|
st->priv_data = ast;
|
|
}
|
|
if(amv_file_format)
|
|
tag1 = stream_index ? MKTAG('a','u','d','s') : MKTAG('v','i','d','s');
|
|
|
|
#ifdef DEBUG
|
|
print_tag("strh", tag1, -1);
|
|
#endif
|
|
if(tag1 == MKTAG('i', 'a', 'v', 's') || tag1 == MKTAG('i', 'v', 'a', 's')){
|
|
int64_t dv_dur;
|
|
|
|
/*
|
|
* After some consideration -- I don't think we
|
|
* have to support anything but DV in type1 AVIs.
|
|
*/
|
|
if (s->nb_streams != 1)
|
|
goto fail;
|
|
|
|
if (handler != MKTAG('d', 'v', 's', 'd') &&
|
|
handler != MKTAG('d', 'v', 'h', 'd') &&
|
|
handler != MKTAG('d', 'v', 's', 'l'))
|
|
goto fail;
|
|
|
|
ast = s->streams[0]->priv_data;
|
|
av_freep(&s->streams[0]->codec->extradata);
|
|
av_freep(&s->streams[0]->codec);
|
|
av_freep(&s->streams[0]);
|
|
s->nb_streams = 0;
|
|
if (CONFIG_DV_DEMUXER) {
|
|
avi->dv_demux = dv_init_demux(s);
|
|
if (!avi->dv_demux)
|
|
goto fail;
|
|
}
|
|
s->streams[0]->priv_data = ast;
|
|
url_fskip(pb, 3 * 4);
|
|
ast->scale = get_le32(pb);
|
|
ast->rate = get_le32(pb);
|
|
url_fskip(pb, 4); /* start time */
|
|
|
|
dv_dur = get_le32(pb);
|
|
if (ast->scale > 0 && ast->rate > 0 && dv_dur > 0) {
|
|
dv_dur *= AV_TIME_BASE;
|
|
s->duration = av_rescale(dv_dur, ast->scale, ast->rate);
|
|
}
|
|
/*
|
|
* else, leave duration alone; timing estimation in utils.c
|
|
* will make a guess based on bitrate.
|
|
*/
|
|
|
|
stream_index = s->nb_streams - 1;
|
|
url_fskip(pb, size - 9*4);
|
|
break;
|
|
}
|
|
|
|
assert(stream_index < s->nb_streams);
|
|
st->codec->stream_codec_tag= handler;
|
|
|
|
get_le32(pb); /* flags */
|
|
get_le16(pb); /* priority */
|
|
get_le16(pb); /* language */
|
|
get_le32(pb); /* initial frame */
|
|
ast->scale = get_le32(pb);
|
|
ast->rate = get_le32(pb);
|
|
if(!(ast->scale && ast->rate)){
|
|
av_log(s, AV_LOG_WARNING, "scale/rate is %u/%u which is invalid. (This file has been generated by broken software.)\n", ast->scale, ast->rate);
|
|
if(frame_period){
|
|
ast->rate = 1000000;
|
|
ast->scale = frame_period;
|
|
}else{
|
|
ast->rate = 25;
|
|
ast->scale = 1;
|
|
}
|
|
}
|
|
av_set_pts_info(st, 64, ast->scale, ast->rate);
|
|
|
|
ast->cum_len=get_le32(pb); /* start */
|
|
st->nb_frames = get_le32(pb);
|
|
|
|
st->start_time = 0;
|
|
get_le32(pb); /* buffer size */
|
|
get_le32(pb); /* quality */
|
|
ast->sample_size = get_le32(pb); /* sample ssize */
|
|
ast->cum_len *= FFMAX(1, ast->sample_size);
|
|
// av_log(s, AV_LOG_DEBUG, "%d %d %d %d\n", ast->rate, ast->scale, ast->start, ast->sample_size);
|
|
|
|
switch(tag1) {
|
|
case MKTAG('v', 'i', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_VIDEO;
|
|
|
|
ast->sample_size = 0;
|
|
break;
|
|
case MKTAG('a', 'u', 'd', 's'):
|
|
codec_type = AVMEDIA_TYPE_AUDIO;
|
|
break;
|
|
case MKTAG('t', 'x', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
break;
|
|
case MKTAG('d', 'a', 't', 's'):
|
|
codec_type = AVMEDIA_TYPE_DATA;
|
|
break;
|
|
default:
|
|
av_log(s, AV_LOG_ERROR, "unknown stream type %X\n", tag1);
|
|
goto fail;
|
|
}
|
|
if(ast->sample_size == 0)
|
|
st->duration = st->nb_frames;
|
|
ast->frame_offset= ast->cum_len;
|
|
url_fskip(pb, size - 12 * 4);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'f'):
|
|
/* stream header */
|
|
if (stream_index >= (unsigned)s->nb_streams || avi->dv_demux) {
|
|
url_fskip(pb, size);
|
|
} else {
|
|
uint64_t cur_pos = url_ftell(pb);
|
|
if (cur_pos < list_end)
|
|
size = FFMIN(size, list_end - cur_pos);
|
|
st = s->streams[stream_index];
|
|
switch(codec_type) {
|
|
case AVMEDIA_TYPE_VIDEO:
|
|
if(amv_file_format){
|
|
st->codec->width=avih_width;
|
|
st->codec->height=avih_height;
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_id = CODEC_ID_AMV;
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
get_le32(pb); /* size */
|
|
st->codec->width = get_le32(pb);
|
|
st->codec->height = (int32_t)get_le32(pb);
|
|
get_le16(pb); /* panes */
|
|
st->codec->bits_per_coded_sample= get_le16(pb); /* depth */
|
|
tag1 = get_le32(pb);
|
|
get_le32(pb); /* ImageSize */
|
|
get_le32(pb); /* XPelsPerMeter */
|
|
get_le32(pb); /* YPelsPerMeter */
|
|
get_le32(pb); /* ClrUsed */
|
|
get_le32(pb); /* ClrImportant */
|
|
|
|
if (tag1 == MKTAG('D', 'X', 'S', 'B') || tag1 == MKTAG('D','X','S','A')) {
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = CODEC_ID_XSUB;
|
|
break;
|
|
}
|
|
|
|
if(size > 10*4 && size<(1<<30)){
|
|
st->codec->extradata_size= size - 10*4;
|
|
st->codec->extradata= av_malloc(st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if (!st->codec->extradata) {
|
|
st->codec->extradata_size= 0;
|
|
return AVERROR(ENOMEM);
|
|
}
|
|
get_buffer(pb, st->codec->extradata, st->codec->extradata_size);
|
|
}
|
|
|
|
if(st->codec->extradata_size & 1) //FIXME check if the encoder really did this correctly
|
|
get_byte(pb);
|
|
|
|
/* Extract palette from extradata if bpp <= 8. */
|
|
/* This code assumes that extradata contains only palette. */
|
|
/* This is true for all paletted codecs implemented in FFmpeg. */
|
|
if (st->codec->extradata_size && (st->codec->bits_per_coded_sample <= 8)) {
|
|
st->codec->palctrl = av_mallocz(sizeof(AVPaletteControl));
|
|
#if HAVE_BIGENDIAN
|
|
for (i = 0; i < FFMIN(st->codec->extradata_size, AVPALETTE_SIZE)/4; i++)
|
|
st->codec->palctrl->palette[i] = av_bswap32(((uint32_t*)st->codec->extradata)[i]);
|
|
#else
|
|
memcpy(st->codec->palctrl->palette, st->codec->extradata,
|
|
FFMIN(st->codec->extradata_size, AVPALETTE_SIZE));
|
|
#endif
|
|
st->codec->palctrl->palette_changed = 1;
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
print_tag("video", tag1, 0);
|
|
#endif
|
|
st->codec->codec_type = AVMEDIA_TYPE_VIDEO;
|
|
st->codec->codec_tag = tag1;
|
|
st->codec->codec_id = ff_codec_get_id(ff_codec_bmp_tags, tag1);
|
|
st->need_parsing = AVSTREAM_PARSE_HEADERS; // This is needed to get the pict type which is necessary for generating correct pts.
|
|
// Support "Resolution 1:1" for Avid AVI Codec
|
|
if(tag1 == MKTAG('A', 'V', 'R', 'n') &&
|
|
st->codec->extradata_size >= 31 &&
|
|
!memcmp(&st->codec->extradata[28], "1:1", 3))
|
|
st->codec->codec_id = CODEC_ID_RAWVIDEO;
|
|
|
|
if(st->codec->codec_tag==0 && st->codec->height > 0 && st->codec->extradata_size < 1U<<30){
|
|
st->codec->extradata_size+= 9;
|
|
st->codec->extradata= av_realloc(st->codec->extradata, st->codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if(st->codec->extradata)
|
|
memcpy(st->codec->extradata + st->codec->extradata_size - 9, "BottomUp", 9);
|
|
}
|
|
st->codec->height= FFABS(st->codec->height);
|
|
|
|
// url_fskip(pb, size - 5 * 4);
|
|
break;
|
|
case AVMEDIA_TYPE_AUDIO:
|
|
ff_get_wav_header(pb, st->codec, size);
|
|
ast->dshow_block_align= st->codec->block_align;
|
|
if(ast->sample_size && st->codec->block_align && ast->sample_size != st->codec->block_align){
|
|
av_log(s, AV_LOG_WARNING, "sample size (%d) != block align (%d)\n", ast->sample_size, st->codec->block_align);
|
|
ast->sample_size= st->codec->block_align;
|
|
}
|
|
if (size&1) /* 2-aligned (fix for Stargate SG-1 - 3x18 - Shades of Grey.avi) */
|
|
url_fskip(pb, 1);
|
|
/* Force parsing as several audio frames can be in
|
|
* one packet and timestamps refer to packet start. */
|
|
st->need_parsing = AVSTREAM_PARSE_TIMESTAMPS;
|
|
/* ADTS header is in extradata, AAC without header must be
|
|
* stored as exact frames. Parser not needed and it will
|
|
* fail. */
|
|
if (st->codec->codec_id == CODEC_ID_AAC && st->codec->extradata_size)
|
|
st->need_parsing = AVSTREAM_PARSE_NONE;
|
|
/* AVI files with Xan DPCM audio (wrongly) declare PCM
|
|
* audio in the header but have Axan as stream_code_tag. */
|
|
if (st->codec->stream_codec_tag == AV_RL32("Axan")){
|
|
st->codec->codec_id = CODEC_ID_XAN_DPCM;
|
|
st->codec->codec_tag = 0;
|
|
}
|
|
if (amv_file_format){
|
|
st->codec->codec_id = CODEC_ID_ADPCM_IMA_AMV;
|
|
ast->dshow_block_align = 0;
|
|
}
|
|
break;
|
|
case AVMEDIA_TYPE_SUBTITLE:
|
|
st->codec->codec_type = AVMEDIA_TYPE_SUBTITLE;
|
|
st->codec->codec_id = CODEC_ID_PROBE;
|
|
break;
|
|
default:
|
|
st->codec->codec_type = AVMEDIA_TYPE_DATA;
|
|
st->codec->codec_id= CODEC_ID_NONE;
|
|
st->codec->codec_tag= 0;
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
break;
|
|
case MKTAG('i', 'n', 'd', 'x'):
|
|
i= url_ftell(pb);
|
|
if(!url_is_streamed(pb) && !(s->flags & AVFMT_FLAG_IGNIDX)){
|
|
read_braindead_odml_indx(s, 0);
|
|
}
|
|
url_fseek(pb, i+size, SEEK_SET);
|
|
break;
|
|
case MKTAG('v', 'p', 'r', 'p'):
|
|
if(stream_index < (unsigned)s->nb_streams && size > 9*4){
|
|
AVRational active, active_aspect;
|
|
|
|
st = s->streams[stream_index];
|
|
get_le32(pb);
|
|
get_le32(pb);
|
|
get_le32(pb);
|
|
get_le32(pb);
|
|
get_le32(pb);
|
|
|
|
active_aspect.den= get_le16(pb);
|
|
active_aspect.num= get_le16(pb);
|
|
active.num = get_le32(pb);
|
|
active.den = get_le32(pb);
|
|
get_le32(pb); //nbFieldsPerFrame
|
|
|
|
if(active_aspect.num && active_aspect.den && active.num && active.den){
|
|
st->sample_aspect_ratio= av_div_q(active_aspect, active);
|
|
//av_log(s, AV_LOG_ERROR, "vprp %d/%d %d/%d\n", active_aspect.num, active_aspect.den, active.num, active.den);
|
|
}
|
|
size -= 9*4;
|
|
}
|
|
url_fseek(pb, size, SEEK_CUR);
|
|
break;
|
|
case MKTAG('s', 't', 'r', 'n'):
|
|
if(s->nb_streams){
|
|
avi_read_tag(s, s->streams[s->nb_streams-1], tag, size);
|
|
break;
|
|
}
|
|
default:
|
|
if(size > 1000000){
|
|
av_log(s, AV_LOG_ERROR, "Something went wrong during header parsing, "
|
|
"I will ignore it and try to continue anyway.\n");
|
|
avi->movi_list = url_ftell(pb) - 4;
|
|
avi->movi_end = url_fsize(pb);
|
|
goto end_of_header;
|
|
}
|
|
/* skip tag */
|
|
size += (size & 1);
|
|
url_fskip(pb, size);
|
|
break;
|
|
}
|
|
}
|
|
end_of_header:
|
|
/* check stream number */
|
|
if (stream_index != s->nb_streams - 1) {
|
|
fail:
|
|
return -1;
|
|
}
|
|
|
|
if(!avi->index_loaded && !url_is_streamed(pb))
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
avi->non_interleaved |= guess_ni_flag(s);
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
if(st->nb_index_entries)
|
|
break;
|
|
}
|
|
if(i==s->nb_streams && avi->non_interleaved) {
|
|
av_log(s, AV_LOG_WARNING, "non-interleaved AVI without index, switching to interleaved\n");
|
|
avi->non_interleaved=0;
|
|
}
|
|
|
|
if(avi->non_interleaved) {
|
|
av_log(s, AV_LOG_INFO, "non-interleaved AVI\n");
|
|
clean_index(s);
|
|
}
|
|
|
|
ff_metadata_conv_ctx(s, NULL, ff_avi_metadata_conv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int read_gab2_sub(AVStream *st, AVPacket *pkt) {
|
|
if (!strcmp(pkt->data, "GAB2") && AV_RL16(pkt->data+5) == 2) {
|
|
uint8_t desc[256], *d = desc;
|
|
uint8_t *end, *ptr = pkt->data+7;
|
|
unsigned int size, desc_len = bytestream_get_le32(&ptr);
|
|
int score = AVPROBE_SCORE_MAX / 2;
|
|
AVIStream *ast = st->priv_data;
|
|
AVInputFormat *sub_demuxer;
|
|
AVRational time_base;
|
|
ByteIOContext *pb;
|
|
AVProbeData pd;
|
|
|
|
if (desc_len > FFMAX(pkt->size-17, 0))
|
|
return 0;
|
|
|
|
end = ptr + desc_len;
|
|
while (ptr < end-1) {
|
|
uint8_t tmp;
|
|
uint32_t ch;
|
|
GET_UTF16(ch, ptr < end-1 ? bytestream_get_le16(&ptr) : 0, break;);
|
|
PUT_UTF8(ch, tmp, if(d-desc < sizeof(desc)-1) *d++ = tmp;);
|
|
}
|
|
*d = 0;
|
|
if (*desc)
|
|
av_metadata_set2(&st->metadata, "title", desc, 0);
|
|
|
|
ptr = end + 2;
|
|
size = bytestream_get_le32(&ptr);
|
|
size = FFMIN(size, pkt->size+pkt->data-ptr);
|
|
|
|
pd = (AVProbeData) { .buf = ptr, .buf_size = size };
|
|
if (!(sub_demuxer = av_probe_input_format2(&pd, 1, &score)))
|
|
return 0;
|
|
|
|
pb = av_alloc_put_byte(ptr, size, 0, NULL, NULL, NULL, NULL);
|
|
if (!av_open_input_stream(&ast->sub_ctx, pb, "", sub_demuxer, NULL)) {
|
|
av_read_packet(ast->sub_ctx, &ast->sub_pkt);
|
|
*st->codec = *ast->sub_ctx->streams[0]->codec;
|
|
ast->sub_ctx->streams[0]->codec->extradata = NULL;
|
|
time_base = ast->sub_ctx->streams[0]->time_base;
|
|
av_set_pts_info(st, 64, time_base.num, time_base.den);
|
|
}
|
|
ast->sub_buffer = pkt->data;
|
|
memset(pkt, 0, sizeof(*pkt));
|
|
return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static AVStream *get_subtitle_pkt(AVFormatContext *s, AVStream *next_st,
|
|
AVPacket *pkt)
|
|
{
|
|
AVIStream *ast, *next_ast = next_st->priv_data;
|
|
int64_t ts, next_ts, ts_min = INT64_MAX;
|
|
AVStream *st, *sub_st = NULL;
|
|
int i;
|
|
|
|
next_ts = av_rescale_q(next_ast->frame_offset, next_st->time_base,
|
|
AV_TIME_BASE_Q);
|
|
|
|
for (i=0; i<s->nb_streams; i++) {
|
|
st = s->streams[i];
|
|
ast = st->priv_data;
|
|
if (st->discard < AVDISCARD_ALL && ast && ast->sub_pkt.data) {
|
|
ts = av_rescale_q(ast->sub_pkt.dts, st->time_base, AV_TIME_BASE_Q);
|
|
if (ts <= next_ts && ts < ts_min) {
|
|
ts_min = ts;
|
|
sub_st = st;
|
|
}
|
|
}
|
|
}
|
|
|
|
if (sub_st) {
|
|
ast = sub_st->priv_data;
|
|
*pkt = ast->sub_pkt;
|
|
pkt->stream_index = sub_st->index;
|
|
if (av_read_packet(ast->sub_ctx, &ast->sub_pkt) < 0)
|
|
ast->sub_pkt.data = NULL;
|
|
}
|
|
return sub_st;
|
|
}
|
|
|
|
static int get_stream_idx(int *d){
|
|
if( d[0] >= '0' && d[0] <= '9'
|
|
&& d[1] >= '0' && d[1] <= '9'){
|
|
return (d[0] - '0') * 10 + (d[1] - '0');
|
|
}else{
|
|
return 100; //invalid stream ID
|
|
}
|
|
}
|
|
|
|
static int avi_read_packet(AVFormatContext *s, AVPacket *pkt)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int n, d[8];
|
|
unsigned int size;
|
|
int64_t i, sync;
|
|
void* dstr;
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
int size = dv_get_packet(avi->dv_demux, pkt);
|
|
if (size >= 0)
|
|
return size;
|
|
}
|
|
|
|
if(avi->non_interleaved){
|
|
int best_stream_index = 0;
|
|
AVStream *best_st= NULL;
|
|
AVIStream *best_ast;
|
|
int64_t best_ts= INT64_MAX;
|
|
int i;
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
int64_t ts= ast->frame_offset;
|
|
int64_t last_ts;
|
|
|
|
if(!st->nb_index_entries)
|
|
continue;
|
|
|
|
last_ts = st->index_entries[st->nb_index_entries - 1].timestamp;
|
|
if(!ast->remaining && ts > last_ts)
|
|
continue;
|
|
|
|
ts = av_rescale_q(ts, st->time_base, (AVRational){FFMAX(1, ast->sample_size), AV_TIME_BASE});
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d/%d %"PRId64"\n", ts, st->time_base.num, st->time_base.den, ast->frame_offset);
|
|
if(ts < best_ts){
|
|
best_ts= ts;
|
|
best_st= st;
|
|
best_stream_index= i;
|
|
}
|
|
}
|
|
if(!best_st)
|
|
return -1;
|
|
|
|
best_ast = best_st->priv_data;
|
|
best_ts = av_rescale_q(best_ts, (AVRational){FFMAX(1, best_ast->sample_size), AV_TIME_BASE}, best_st->time_base);
|
|
if(best_ast->remaining)
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY | AVSEEK_FLAG_BACKWARD);
|
|
else{
|
|
i= av_index_search_timestamp(best_st, best_ts, AVSEEK_FLAG_ANY);
|
|
if(i>=0)
|
|
best_ast->frame_offset= best_st->index_entries[i].timestamp;
|
|
}
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%d\n", i);
|
|
if(i>=0){
|
|
int64_t pos= best_st->index_entries[i].pos;
|
|
pos += best_ast->packet_size - best_ast->remaining;
|
|
url_fseek(s->pb, pos + 8, SEEK_SET);
|
|
// av_log(s, AV_LOG_DEBUG, "pos=%"PRId64"\n", pos);
|
|
|
|
assert(best_ast->remaining <= best_ast->packet_size);
|
|
|
|
avi->stream_index= best_stream_index;
|
|
if(!best_ast->remaining)
|
|
best_ast->packet_size=
|
|
best_ast->remaining= best_st->index_entries[i].size;
|
|
}
|
|
}
|
|
|
|
resync:
|
|
if(avi->stream_index >= 0){
|
|
AVStream *st= s->streams[ avi->stream_index ];
|
|
AVIStream *ast= st->priv_data;
|
|
int size, err;
|
|
|
|
if(get_subtitle_pkt(s, st, pkt))
|
|
return 0;
|
|
|
|
if(ast->sample_size <= 1) // minorityreport.AVI block_align=1024 sample_size=1 IMA-ADPCM
|
|
size= INT_MAX;
|
|
else if(ast->sample_size < 32)
|
|
// arbitrary multiplier to avoid tiny packets for raw PCM data
|
|
size= 1024*ast->sample_size;
|
|
else
|
|
size= ast->sample_size;
|
|
|
|
if(size > ast->remaining)
|
|
size= ast->remaining;
|
|
avi->last_pkt_pos= url_ftell(pb);
|
|
err= av_get_packet(pb, pkt, size);
|
|
if(err<0)
|
|
return err;
|
|
|
|
if(ast->has_pal && pkt->data && pkt->size<(unsigned)INT_MAX/2){
|
|
void *ptr= av_realloc(pkt->data, pkt->size + 4*256 + FF_INPUT_BUFFER_PADDING_SIZE);
|
|
if(ptr){
|
|
ast->has_pal=0;
|
|
pkt->size += 4*256;
|
|
pkt->data= ptr;
|
|
memcpy(pkt->data + pkt->size - 4*256, ast->pal, 4*256);
|
|
}else
|
|
av_log(s, AV_LOG_ERROR, "Failed to append palette\n");
|
|
}
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
dstr = pkt->destruct;
|
|
size = dv_produce_packet(avi->dv_demux, pkt,
|
|
pkt->data, pkt->size);
|
|
pkt->destruct = dstr;
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
if (size < 0)
|
|
av_free_packet(pkt);
|
|
} else if (st->codec->codec_type == AVMEDIA_TYPE_SUBTITLE
|
|
&& !st->codec->codec_tag && read_gab2_sub(st, pkt)) {
|
|
ast->frame_offset++;
|
|
avi->stream_index = -1;
|
|
ast->remaining = 0;
|
|
goto resync;
|
|
} else {
|
|
/* XXX: How to handle B-frames in AVI? */
|
|
pkt->dts = ast->frame_offset;
|
|
// pkt->dts += ast->start;
|
|
if(ast->sample_size)
|
|
pkt->dts /= ast->sample_size;
|
|
//av_log(s, AV_LOG_DEBUG, "dts:%"PRId64" offset:%"PRId64" %d/%d smpl_siz:%d base:%d st:%d size:%d\n", pkt->dts, ast->frame_offset, ast->scale, ast->rate, ast->sample_size, AV_TIME_BASE, avi->stream_index, size);
|
|
pkt->stream_index = avi->stream_index;
|
|
|
|
if (st->codec->codec_type == AVMEDIA_TYPE_VIDEO) {
|
|
AVIndexEntry *e;
|
|
int index;
|
|
assert(st->index_entries);
|
|
|
|
index= av_index_search_timestamp(st, ast->frame_offset, 0);
|
|
e= &st->index_entries[index];
|
|
|
|
if(index >= 0 && e->timestamp == ast->frame_offset){
|
|
if (e->flags & AVINDEX_KEYFRAME)
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
} else {
|
|
pkt->flags |= AV_PKT_FLAG_KEY;
|
|
}
|
|
ast->frame_offset += get_duration(ast, pkt->size);
|
|
}
|
|
ast->remaining -= size;
|
|
if(!ast->remaining){
|
|
avi->stream_index= -1;
|
|
ast->packet_size= 0;
|
|
}
|
|
|
|
return size;
|
|
}
|
|
|
|
memset(d, -1, sizeof(int)*8);
|
|
for(i=sync=url_ftell(pb); !url_feof(pb); i++) {
|
|
int j;
|
|
|
|
for(j=0; j<7; j++)
|
|
d[j]= d[j+1];
|
|
d[7]= get_byte(pb);
|
|
|
|
size= d[4] + (d[5]<<8) + (d[6]<<16) + (d[7]<<24);
|
|
|
|
n= get_stream_idx(d+2);
|
|
//av_log(s, AV_LOG_DEBUG, "%X %X %X %X %X %X %X %X %"PRId64" %d %d\n", d[0], d[1], d[2], d[3], d[4], d[5], d[6], d[7], i, size, n);
|
|
if(i + (uint64_t)size > avi->fsize || d[0]<0)
|
|
continue;
|
|
|
|
//parse ix##
|
|
if( (d[0] == 'i' && d[1] == 'x' && n < s->nb_streams)
|
|
//parse JUNK
|
|
||(d[0] == 'J' && d[1] == 'U' && d[2] == 'N' && d[3] == 'K')
|
|
||(d[0] == 'i' && d[1] == 'd' && d[2] == 'x' && d[3] == '1')){
|
|
url_fskip(pb, size);
|
|
//av_log(s, AV_LOG_DEBUG, "SKIP\n");
|
|
goto resync;
|
|
}
|
|
|
|
//parse stray LIST
|
|
if(d[0] == 'L' && d[1] == 'I' && d[2] == 'S' && d[3] == 'T'){
|
|
url_fskip(pb, 4);
|
|
goto resync;
|
|
}
|
|
|
|
n= get_stream_idx(d);
|
|
|
|
if(!((i-avi->last_pkt_pos)&1) && get_stream_idx(d+1) < s->nb_streams)
|
|
continue;
|
|
|
|
//detect ##ix chunk and skip
|
|
if(d[2] == 'i' && d[3] == 'x' && n < s->nb_streams){
|
|
url_fskip(pb, size);
|
|
goto resync;
|
|
}
|
|
|
|
//parse ##dc/##wb
|
|
if(n < s->nb_streams){
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
st = s->streams[n];
|
|
ast = st->priv_data;
|
|
|
|
if(s->nb_streams>=2){
|
|
AVStream *st1 = s->streams[1];
|
|
AVIStream *ast1= st1->priv_data;
|
|
//workaround for broken small-file-bug402.avi
|
|
if( d[2] == 'w' && d[3] == 'b'
|
|
&& n==0
|
|
&& st ->codec->codec_type == AVMEDIA_TYPE_VIDEO
|
|
&& st1->codec->codec_type == AVMEDIA_TYPE_AUDIO
|
|
&& ast->prefix == 'd'*256+'c'
|
|
&& (d[2]*256+d[3] == ast1->prefix || !ast1->prefix_count)
|
|
){
|
|
n=1;
|
|
st = st1;
|
|
ast = ast1;
|
|
av_log(s, AV_LOG_WARNING, "Invalid stream + prefix combination, assuming audio.\n");
|
|
}
|
|
}
|
|
|
|
|
|
if( (st->discard >= AVDISCARD_DEFAULT && size==0)
|
|
/*|| (st->discard >= AVDISCARD_NONKEY && !(pkt->flags & AV_PKT_FLAG_KEY))*/ //FIXME needs a little reordering
|
|
|| st->discard >= AVDISCARD_ALL){
|
|
ast->frame_offset += get_duration(ast, size);
|
|
url_fskip(pb, size);
|
|
goto resync;
|
|
}
|
|
|
|
if (d[2] == 'p' && d[3] == 'c' && size<=4*256+4) {
|
|
int k = get_byte(pb);
|
|
int last = (k + get_byte(pb) - 1) & 0xFF;
|
|
|
|
get_le16(pb); //flags
|
|
|
|
for (; k <= last; k++)
|
|
ast->pal[k] = get_be32(pb)>>8;// b + (g << 8) + (r << 16);
|
|
ast->has_pal= 1;
|
|
goto resync;
|
|
} else if( ((ast->prefix_count<5 || sync+9 > i) && d[2]<128 && d[3]<128) ||
|
|
d[2]*256+d[3] == ast->prefix /*||
|
|
(d[2] == 'd' && d[3] == 'c') ||
|
|
(d[2] == 'w' && d[3] == 'b')*/) {
|
|
|
|
//av_log(s, AV_LOG_DEBUG, "OK\n");
|
|
if(d[2]*256+d[3] == ast->prefix)
|
|
ast->prefix_count++;
|
|
else{
|
|
ast->prefix= d[2]*256+d[3];
|
|
ast->prefix_count= 0;
|
|
}
|
|
|
|
avi->stream_index= n;
|
|
ast->packet_size= size + 8;
|
|
ast->remaining= size;
|
|
|
|
if(size || !ast->sample_size){
|
|
uint64_t pos= url_ftell(pb) - 8;
|
|
if(!st->index_entries || !st->nb_index_entries || st->index_entries[st->nb_index_entries - 1].pos < pos){
|
|
av_add_index_entry(st, pos, ast->frame_offset, size, 0, AVINDEX_KEYFRAME);
|
|
}
|
|
}
|
|
goto resync;
|
|
}
|
|
}
|
|
}
|
|
|
|
return AVERROR_EOF;
|
|
}
|
|
|
|
/* XXX: We make the implicit supposition that the positions are sorted
|
|
for each stream. */
|
|
static int avi_read_idx1(AVFormatContext *s, int size)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
int nb_index_entries, i;
|
|
AVStream *st;
|
|
AVIStream *ast;
|
|
unsigned int index, tag, flags, pos, len;
|
|
unsigned last_pos= -1;
|
|
|
|
nb_index_entries = size / 16;
|
|
if (nb_index_entries <= 0)
|
|
return -1;
|
|
|
|
/* Read the entries and sort them in each stream component. */
|
|
for(i = 0; i < nb_index_entries; i++) {
|
|
tag = get_le32(pb);
|
|
flags = get_le32(pb);
|
|
pos = get_le32(pb);
|
|
len = get_le32(pb);
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(s, AV_LOG_DEBUG, "%d: tag=0x%x flags=0x%x pos=0x%x len=%d/",
|
|
i, tag, flags, pos, len);
|
|
#endif
|
|
if(i==0 && pos > avi->movi_list)
|
|
avi->movi_list= 0; //FIXME better check
|
|
pos += avi->movi_list;
|
|
|
|
index = ((tag & 0xff) - '0') * 10;
|
|
index += ((tag >> 8) & 0xff) - '0';
|
|
if (index >= s->nb_streams)
|
|
continue;
|
|
st = s->streams[index];
|
|
ast = st->priv_data;
|
|
|
|
#if defined(DEBUG_SEEK)
|
|
av_log(s, AV_LOG_DEBUG, "%d cum_len=%"PRId64"\n", len, ast->cum_len);
|
|
#endif
|
|
if(url_feof(pb))
|
|
return -1;
|
|
|
|
if(last_pos == pos)
|
|
avi->non_interleaved= 1;
|
|
else if(len || !ast->sample_size)
|
|
av_add_index_entry(st, pos, ast->cum_len, len, 0, (flags&AVIIF_INDEX) ? AVINDEX_KEYFRAME : 0);
|
|
ast->cum_len += get_duration(ast, len);
|
|
last_pos= pos;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int guess_ni_flag(AVFormatContext *s){
|
|
int i;
|
|
int64_t last_start=0;
|
|
int64_t first_end= INT64_MAX;
|
|
int64_t oldpos= url_ftell(s->pb);
|
|
|
|
for(i=0; i<s->nb_streams; i++){
|
|
AVStream *st = s->streams[i];
|
|
int n= st->nb_index_entries;
|
|
unsigned int size;
|
|
|
|
if(n <= 0)
|
|
continue;
|
|
|
|
if(n >= 2){
|
|
int64_t pos= st->index_entries[0].pos;
|
|
url_fseek(s->pb, pos + 4, SEEK_SET);
|
|
size= get_le32(s->pb);
|
|
if(pos + size > st->index_entries[1].pos)
|
|
last_start= INT64_MAX;
|
|
}
|
|
|
|
if(st->index_entries[0].pos > last_start)
|
|
last_start= st->index_entries[0].pos;
|
|
if(st->index_entries[n-1].pos < first_end)
|
|
first_end= st->index_entries[n-1].pos;
|
|
}
|
|
url_fseek(s->pb, oldpos, SEEK_SET);
|
|
return last_start > first_end;
|
|
}
|
|
|
|
static int avi_load_index(AVFormatContext *s)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
ByteIOContext *pb = s->pb;
|
|
uint32_t tag, size;
|
|
int64_t pos= url_ftell(pb);
|
|
int ret = -1;
|
|
|
|
if (url_fseek(pb, avi->movi_end, SEEK_SET) < 0)
|
|
goto the_end; // maybe truncated file
|
|
#ifdef DEBUG_SEEK
|
|
printf("movi_end=0x%"PRIx64"\n", avi->movi_end);
|
|
#endif
|
|
for(;;) {
|
|
if (url_feof(pb))
|
|
break;
|
|
tag = get_le32(pb);
|
|
size = get_le32(pb);
|
|
#ifdef DEBUG_SEEK
|
|
printf("tag=%c%c%c%c size=0x%x\n",
|
|
tag & 0xff,
|
|
(tag >> 8) & 0xff,
|
|
(tag >> 16) & 0xff,
|
|
(tag >> 24) & 0xff,
|
|
size);
|
|
#endif
|
|
switch(tag) {
|
|
case MKTAG('i', 'd', 'x', '1'):
|
|
if (avi_read_idx1(s, size) < 0)
|
|
goto skip;
|
|
ret = 0;
|
|
goto the_end;
|
|
break;
|
|
default:
|
|
skip:
|
|
size += (size & 1);
|
|
if (url_fseek(pb, size, SEEK_CUR) < 0)
|
|
goto the_end; // something is wrong here
|
|
break;
|
|
}
|
|
}
|
|
the_end:
|
|
url_fseek(pb, pos, SEEK_SET);
|
|
return ret;
|
|
}
|
|
|
|
static void seek_subtitle(AVStream *st, AVStream *st2, int64_t timestamp)
|
|
{
|
|
AVIStream *ast2 = st2->priv_data;
|
|
int64_t ts2 = av_rescale_q(timestamp, st->time_base, st2->time_base);
|
|
av_free_packet(&ast2->sub_pkt);
|
|
if (avformat_seek_file(ast2->sub_ctx, 0, INT64_MIN, ts2, ts2, 0) >= 0 ||
|
|
avformat_seek_file(ast2->sub_ctx, 0, ts2, ts2, INT64_MAX, 0) >= 0)
|
|
av_read_packet(ast2->sub_ctx, &ast2->sub_pkt);
|
|
}
|
|
|
|
static int avi_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
|
|
{
|
|
AVIContext *avi = s->priv_data;
|
|
AVStream *st;
|
|
int i, index;
|
|
int64_t pos;
|
|
AVIStream *ast;
|
|
|
|
if (!avi->index_loaded) {
|
|
/* we only load the index on demand */
|
|
avi_load_index(s);
|
|
avi->index_loaded = 1;
|
|
}
|
|
assert(stream_index>= 0);
|
|
|
|
st = s->streams[stream_index];
|
|
ast= st->priv_data;
|
|
index= av_index_search_timestamp(st, timestamp * FFMAX(ast->sample_size, 1), flags);
|
|
if(index<0)
|
|
return -1;
|
|
|
|
/* find the position */
|
|
pos = st->index_entries[index].pos;
|
|
timestamp = st->index_entries[index].timestamp / FFMAX(ast->sample_size, 1);
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "XX %"PRId64" %d %"PRId64"\n", timestamp, index, st->index_entries[index].timestamp);
|
|
|
|
if (CONFIG_DV_DEMUXER && avi->dv_demux) {
|
|
/* One and only one real stream for DV in AVI, and it has video */
|
|
/* offsets. Calling with other stream indexes should have failed */
|
|
/* the av_index_search_timestamp call above. */
|
|
assert(stream_index == 0);
|
|
|
|
/* Feed the DV video stream version of the timestamp to the */
|
|
/* DV demux so it can synthesize correct timestamps. */
|
|
dv_offset_reset(avi->dv_demux, timestamp);
|
|
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
for(i = 0; i < s->nb_streams; i++) {
|
|
AVStream *st2 = s->streams[i];
|
|
AVIStream *ast2 = st2->priv_data;
|
|
|
|
ast2->packet_size=
|
|
ast2->remaining= 0;
|
|
|
|
if (ast2->sub_ctx) {
|
|
seek_subtitle(st, st2, timestamp);
|
|
continue;
|
|
}
|
|
|
|
if (st2->nb_index_entries <= 0)
|
|
continue;
|
|
|
|
// assert(st2->codec->block_align);
|
|
assert((int64_t)st2->time_base.num*ast2->rate == (int64_t)st2->time_base.den*ast2->scale);
|
|
index = av_index_search_timestamp(
|
|
st2,
|
|
av_rescale_q(timestamp, st->time_base, st2->time_base) * FFMAX(ast2->sample_size, 1),
|
|
flags | AVSEEK_FLAG_BACKWARD);
|
|
if(index<0)
|
|
index=0;
|
|
|
|
if(!avi->non_interleaved){
|
|
while(index>0 && st2->index_entries[index].pos > pos)
|
|
index--;
|
|
while(index+1 < st2->nb_index_entries && st2->index_entries[index].pos < pos)
|
|
index++;
|
|
}
|
|
|
|
// av_log(s, AV_LOG_DEBUG, "%"PRId64" %d %"PRId64"\n", timestamp, index, st2->index_entries[index].timestamp);
|
|
/* extract the current frame number */
|
|
ast2->frame_offset = st2->index_entries[index].timestamp;
|
|
}
|
|
|
|
/* do the seek */
|
|
url_fseek(s->pb, pos, SEEK_SET);
|
|
avi->stream_index= -1;
|
|
return 0;
|
|
}
|
|
|
|
static int avi_read_close(AVFormatContext *s)
|
|
{
|
|
int i;
|
|
AVIContext *avi = s->priv_data;
|
|
|
|
for(i=0;i<s->nb_streams;i++) {
|
|
AVStream *st = s->streams[i];
|
|
AVIStream *ast = st->priv_data;
|
|
av_free(st->codec->palctrl);
|
|
if (ast) {
|
|
if (ast->sub_ctx) {
|
|
av_freep(&ast->sub_ctx->pb);
|
|
av_close_input_stream(ast->sub_ctx);
|
|
}
|
|
av_free(ast->sub_buffer);
|
|
av_free_packet(&ast->sub_pkt);
|
|
}
|
|
}
|
|
|
|
if (avi->dv_demux)
|
|
av_free(avi->dv_demux);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int avi_probe(AVProbeData *p)
|
|
{
|
|
int i;
|
|
|
|
/* check file header */
|
|
for(i=0; avi_headers[i][0]; i++)
|
|
if(!memcmp(p->buf , avi_headers[i] , 4) &&
|
|
!memcmp(p->buf+8, avi_headers[i]+4, 4))
|
|
return AVPROBE_SCORE_MAX;
|
|
|
|
return 0;
|
|
}
|
|
|
|
AVInputFormat avi_demuxer = {
|
|
"avi",
|
|
NULL_IF_CONFIG_SMALL("AVI format"),
|
|
sizeof(AVIContext),
|
|
avi_probe,
|
|
avi_read_header,
|
|
avi_read_packet,
|
|
avi_read_close,
|
|
avi_read_seek,
|
|
};
|